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The optical and electronic properties of thin films of the solution-processible polymer poly-(CH(3))(3)Si-cyclooctatetraene are presented. This conjugated polymer is based on a polyacetylene backbone with (CH(3))(3)Si side groups. Thin transparent films have been cast onto n-doped silicon (n-Si) substrates and doped with iodine to form surfacebarrier solar cells. The devices produce photovoltages that are at the theoretical limit and that are much greater than can be obtained from n-Si contacts with conventional metals. Two methods for forming layered polymeric materials, one involving the spincoating of preformed polymers and the other comprising the sequential polymerization of different monomers, are also described. An organic polymer analog of a metal/insulator/metal capacitor has been constructed with the latter method.

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Highly conjugated polymers, such as polyacetylene, polythiophene, and poly(p-phenylene vinylene), have been the subject of intensive research due to their intriguing optical and electronic properties.1 2 These parent systems are highly desirable for experimental and theoretical studies due to their simplicity. Their intractability, however, has made characterization an arduous task, and insolubility has severely limited their applications. Researchers have successfully circumvented these obstacles by synthesizing soluble alkyl-and alkoxy-substituted polythiophenes and poly-(p-phenylene vinylenes).3 45Analogous soluble highly conjugated polyacetylene derivatives have proven more elusive.4,5 We report here the synthesis of such a polymer using ring-opening metathesis polymerization (ROMP).6Recently, Klavetter and Grubbs reported the synthesis of polyacetylene by the ring-opening metathesis polymerization of cyclooctatetraene with a well-defined non-Lewis acidic tungsten alkylidene catalyst.7•8 *ROMP of substituted cyclooctatetraenes